import CodeMirror from "codemirror/lib/codemirror";
(function () {
  CodeMirror.extendMode('css', {
    commentStart: '/*',
    commentEnd: '*/',
    newlineAfterToken: function (type, content) {
      return /^[;{}]$/.test(content)
    }
  })

  // Comment/uncomment the specified range
  CodeMirror.defineExtension('commentRange', function (isComment, from, to) {
    var cm = this; var curMode = CodeMirror.innerMode(cm.getMode(), cm.getTokenAt(from).state).mode
    cm.operation(function () {
      if (isComment) { // Comment range
        cm.replaceRange(curMode.commentEnd, to)
        cm.replaceRange(curMode.commentStart, from)
        if (from.line == to.line && from.ch == to.ch) // An empty comment inserted - put cursor inside
        { cm.setCursor(from.line, from.ch + curMode.commentStart.length) }
      } else { // Uncomment range
        var selText = cm.getRange(from, to)
        var startIndex = selText.indexOf(curMode.commentStart)
        var endIndex = selText.lastIndexOf(curMode.commentEnd)
        if (startIndex > -1 && endIndex > -1 && endIndex > startIndex) {
          // Take string till comment start
          selText = selText.substr(0, startIndex) +
          // From comment start till comment end
              selText.substring(startIndex + curMode.commentStart.length, endIndex) +
          // From comment end till string end
              selText.substr(endIndex + curMode.commentEnd.length)
        }
        cm.replaceRange(selText, from, to)
      }
    })
  })

  // Applies automatic mode-aware indentation to the specified range
  CodeMirror.defineExtension('autoIndentRange', function (from, to) {
    var cmInstance = this
    this.operation(function () {
      for (var i = from.line; i <= to.line; i++) {
        cmInstance.indentLine(i, 'smart')
      }
    })
  })

  // Applies automatic formatting to the specified range
  CodeMirror.defineExtension('autoFormatRange', function (from, to) {
    var cm = this
    var outer = cm.getMode(); var text = cm.getRange(from, to).split('\n')
    var state = CodeMirror.copyState(outer, cm.getTokenAt(from).state)
    var tabSize = cm.getOption('tabSize')

    var out = ''; var lines = 0; var atSol = from.ch == 0
    function newline () {
      out += '\n'
      atSol = true
      ++lines
    }

    for (var i = 0; i < text.length; ++i) {
      var stream = new CodeMirror.StringStream(text[i], tabSize)
      while (!stream.eol()) {
        var inner = CodeMirror.innerMode(outer, state)
        var style = outer.token(stream, state); var cur = stream.current()
        stream.start = stream.pos
        if (!atSol || /\S/.test(cur)) {
          out += cur
          atSol = false
        }
        if (!atSol && inner.mode.newlineAfterToken &&
              inner.mode.newlineAfterToken(style, cur, stream.string.slice(stream.pos) || text[i + 1] || '', inner.state)) { newline() }
      }
      if (!stream.pos && outer.blankLine) outer.blankLine(state)
      if (!atSol) newline()
    }

    cm.operation(function () {
      cm.replaceRange(out, from, to)
      for (var cur = from.line + 1, end = from.line + lines; cur <= end; ++cur) { cm.indentLine(cur, 'smart') }
      cm.setSelection(from, cm.getCursor(false))
    })
  })
})()
